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junction box size and location in ceiling void.

Former Community Member over 4 years ago

I am currently in the position of rewiring several sets of downlighters for a large kitchen / diner / living area.

There is currently a pretty awful setup of 'choc' connectors screwed to a joist and then a cats nest of cabling to this from/to the various zones of lights.

Clearly going forwards this is not acceptable and given that the whole ceiling is down at present I am keen to put this right.

I am planning on terminating the cabling in a junction box. All of the 1mm2 t&e is now installed and I would like to use the wagobox XL, however the joists are only 170mm in depth and pretty much any junction box which offers enough space to comfortably perform all the connections required would put the junction box within 50mm of the top or bottom of the joist.

Could someone point me in the right direction to understanding the rules of junction box placement in this context? I cannot see anything in my on site guide.

Many thanks

James

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0 Former Community Member over 4 years ago

AJJewsbury:

Also the 50mm limit is just for cables running through holes in joists - it doesn't apply elsewhere e.g. in the general void.

- Andy.

That's interesting, because you are the second person to say this but this wasn't how I interpreted the detail in the on site guide, which says:

"Where a low voltage cable is installed under a floor or above a ceiling it must be run in such a position that it is not liable to be damaged by contact with the floor or ceiling or the fixings thereof. A cable passing through a joist, under floorboards or ceiling support must

(a) be at least 50 mm from the top or bottom, as appropriate, or"

Which I took to mean if a cable is passing through a joist or under floorboards or above a ceiling support.

Does it actually mean - "A cable when passing through a joist that has or will have floorboards or a ceiling attached to it must (a) etc " ?

This would explain why I am getting this answer of it doesnt matter where your cables are clipped to the joist.
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0 Former Community Member over 4 years ago

AJJewsbury:

Also the 50mm limit is just for cables running through holes in joists - it doesn't apply elsewhere e.g. in the general void.

- Andy.

That's interesting, because you are the second person to say this but this wasn't how I interpreted the detail in the on site guide, which says:

"Where a low voltage cable is installed under a floor or above a ceiling it must be run in such a position that it is not liable to be damaged by contact with the floor or ceiling or the fixings thereof. A cable passing through a joist, under floorboards or ceiling support must

(a) be at least 50 mm from the top or bottom, as appropriate, or"

Which I took to mean if a cable is passing through a joist or under floorboards or above a ceiling support.

Does it actually mean - "A cable when passing through a joist that has or will have floorboards or a ceiling attached to it must (a) etc " ?

This would explain why I am getting this answer of it doesnt matter where your cables are clipped to the joist.
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junction box size and location in ceiling void.

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